That K-Pop phenom Psy was slated to close last night's American Music Awards surprised no one — after all, he is the most liked musician in YouTube history — but Psy still managed to sneak in a little surprise of his own.

Halfway through his performance of "Gangnam Style," the Invisible Horseman of the K-Popclayps — already decked out in Hammer pants — invited the godfather of novelty dances MC Hammer on stage for a house-demolishing mashup of "Gangnam Style" and "Too Legit to Quit."